scholarly journals High-Performance Accuracy of Daylight-Responsive Dimming Systems with Illuminance by Distant Luminaires for Energy-Saving Buildings

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 731 ◽  
Author(s):  
In-Tae Kim ◽  
Yu-Sin Kim ◽  
Meeryoung Cho ◽  
Hyeonggon Nam ◽  
Anseop Choi ◽  
...  
Keyword(s):  
Energy Saving ◽  
High Performance ◽  
Control Algorithm ◽  
Energy Savings ◽  
Prediction Method ◽  
Full Scale ◽  
Performance Accuracy ◽  
Photo Sensor ◽  
Lighting Energy ◽  
Dimming Control

In a conventional daylight-responsive dimming system (DRDS), all the luminaires are turned off during the calibration process except for the luminaire under consideration in order to sense only the workplane illuminance of that luminaire. However, the workplane illuminance of the luminaire is influenced by other luminaires. Therefore, the final workplane illuminance of the actual operated system is higher than the target workplane illuminance, reducing the energy-saving efficiency of the DRDS. Herein, to improve the conventional DRDS, an advanced commissioning prediction method of daylight illuminance, and a dimming control algorithm considering the influences by distant luminaires are proposed. To evaluate the accuracy of the proposed prediction method of daylight illuminance, the daylight illuminance on the workplane and the photo sensor values of six points were measured in a full-scale mockup for 27 consecutive days from 22 June to 18 July 2018. As a result of root-mean-square error (RMSE) analysis of daylight illuminance and the photo sensor values, the RMSE (64.86) of P3 located in the middle of the room was the highest, and the RMSE value (17.60) of P5 located near the window was the lowest. In addition, the power consumption of the luminaires, and the target illuminance accuracy of the proposed DRDS were measured and analyzed for 32 consecutive days from 19 July to 19 August 2018 in a full-scale mockup. The average target illuminance accuracy was 96.9% (SD 2.2%), the average lighting energy-savings ratio was 78.4%, and the daylight illuminance prediction accuracy was 95.5% (SD 3.4%).

Study on movable light-shelf system with location-awareness technology for lighting energy saving

2016 ◽  
Vol 26 (6) ◽  
pp. 796-812 ◽  
Author(s):  
Heangwoo Lee ◽  
Sang-hoon Gim ◽  
Janghoo Seo ◽  
Yongseong Kim
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Energy Savings ◽  
Full Scale ◽  
Location Awareness ◽  
Energy Saving Potential ◽  
Recent Increase ◽  
Lighting Energy ◽  
External Conditions ◽  
Incoming Light

Various ongoing studies regard light-shelves as one solution to the recent increase in lighting energy consumption. However, in previous light-shelf systems, the direction of incoming light was determined by external conditions, thereby limiting the efficiency of lighting energy saving. The purpose of the present study was to develop a movable light-shelf system with location-awareness technology and verify its performance. In this study, a full-scale testbed was established in order to test the proposed movable light-shelf system with location awareness as well as to verify its energy saving potential. The results were analysed and compared with the performances of previous fixed (Case 1) and movable (Case 2) light-shelf systems without location-awareness technology. The obtained results were as follows. (1) The proposed light-shelf system can respond to external conditions and to the location of the occupant by means of the control axis of the light-shelf module angle through modulation between the control axis of the angle of the previous light-shelf and the reflector of the light-shelf. (2) The proposed light-shelf system provides 90.0% and 86.6%/91.0% energy savings in comparison to Case 1 and Case 2, respectively.

scholarly journals Advanced Dimming Control Algorithm for Sustainable Buildings by Daylight Responsive Dimming System

2018 ◽  
Vol 10 (11) ◽  
pp. 4087
Author(s):  
In-Tae Kim ◽  
Yu-Sin Kim ◽  
Hyeonggon Nam ◽  
Taeyon Hwang
Keyword(s):  
Power Consumption ◽  
Control Algorithm ◽  
Energy Savings ◽  
The Other ◽  
System Operation ◽  
Sustainable Buildings ◽  
Average Accuracy ◽  
Lighting Energy ◽  
Dimming Control ◽  
Final Work

This study aims to evaluate the accuracy and energy savings of a daylight responsive dimming system (DRDS) when considering the influence of indirect illuminance. In the case of the existing DRDS, during the calibration process of each luminaire, the other luminaires were turned off to detect the illuminance of both the luminaire and the incoming daylight. However, the work plane illuminance under the luminaires was affected by the indirect illuminance from the other luminaires. The final work plane illuminance would thus be higher than the target illuminance during real system operation. To improve the accuracy and energy savings of the DRDS, an improved dimming control algorithm was applied to the DRDS when considering the influence of indirect illuminance. The real-time power consumption and accuracy of the target illuminance of the DRDS when considering the influence of indirect illuminance in a full-scale mock-up was measured and analyzed (for 23 days, from 22 June to 18 July 2018). As a result, the average accuracy of the target illuminance was 98.9% (SD 0.5%), and the average saving in lighting energy was 77%.

scholarly journals Impact of Building Orientation on Daylight Availability and Energy Savings Potential in an Academic Classroom

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4916
Author(s):  
Aniela Kaminska
Keyword(s):  
Economic Analysis ◽  
Energy Savings ◽  
Electricity Consumption ◽  
The South ◽  
Building Orientation ◽  
Payback Time ◽  
Lighting Energy ◽  
Dimming Control ◽  
Numerical Indicator

In this paper, daylight availability depending on building orientation in a typical educational classroom was investigated. Measurements of daylight illuminance distributions in the room depth for different illuminance outside the building allowed to determine the conditions when the luminaires in a classroom could be turned off, turned on, or dimmed. The outdoor daylight illuminance on the south-east and north façade of the building was recorded and the numbers of hours per year of university activity during which the lighting had to be switched on (up to 100% or brightened) were determined. Based on these numbers and luminaires powers the electricity consumption for lighting was estimated. It was proven that by using dimming control depending on daylight distribution in a room, comparable energy savings could be achieved for different building orientations. These savings of over 30% were greater than through the implementation of on/off control which, for a south-east oriented classroom reached about 28% and for a north-oriented one they were two times lower. Economic analysis showed payback time for dimming control around two years, which was longer than for on/off control. The electricity consumption estimated experimentally was also compared with the lighting energy numerical indicator (LENI) calculated according the standard EN 15193 1: 2017.

scholarly journals Heating, Cooling, and Lighting Energy Demand Simulation Analysis of Kinetic Shading Devices with Automatic Dimming Control for Asian Countries

2019 ◽  
Vol 11 (5) ◽  
pp. 1253 ◽  
Author(s):  
Byungyun Lee
Keyword(s):  
Total Energy ◽  
Energy Saving ◽  
Energy Demand ◽  
Energy Performance ◽  
Optimal Operation ◽  
Optimal Position ◽  
Energy Demands ◽  
Lighting Energy ◽  
Dimming Control ◽  
Shading Devices

Kinetic shading devices have recently been introduced for energy-saving and for their innovative appearance. Quantifiable research on kinetic operation systems is necessary to evaluate their applicability in a specific region. This study developed a theoretical methodology for producing an optimal positioning algorithm targeting minimizing total energy demands of kinetic shading devices; the control algorithms for hourly operation were tested through a combined analysis framework of energy performance simulations and spreadsheet analysis. Two common types of external shading devices, vertical-folding and horizontal-rotating types, were simulated in three Asian cities with different climate conditions. Automatic kinetic operation with a consequential dimming control was simulated on the east, south and west facade of an office building, selecting the optimal position every hour based on total energy demand for heating, cooling, and lighting. Comparative simulation analyses for kinetic operation and fixed shading demonstrated that the energy saving potential of fixed shading was greater than that of kinetic operation shading. Kinetic operation was the most applicable in Seoul, where seasonal optimal operation was required for both types of kinetic shadings. In Abu Dhabi and Hanoi, cooling and lighting energy demands were balanced every hour through kinetic operation. Rotating-type kinetic operation in these two regions resulted in better energy-saving performance. The operation frequency pattern of rotating-type kinetic shading provided more active operation and consequent outperformance over the folding-type.

scholarly journals Performance Evaluation of External Light Shelves by Applying a Prism Sheet

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4618 ◽  
Author(s):  
Heangwoo Lee ◽  
Janghoo Seo
Keyword(s):  
Performance Evaluation ◽  
Energy Consumption ◽  
Economic Efficiency ◽  
Energy Savings ◽  
Building Energy ◽  
Full Scale ◽  
Natural Light ◽  
Building Sector ◽  
Sector Research ◽  
Lighting Energy

To address the increased use of lighting energy in the building sector, research on the use of light shelves has been increasing. Previous studies have focused on applying operating techniques to improve daylighting performance, which reduces the economic efficiency of light shelves and the building energy savings. This study proposes the use of prism sheets to improve the performance of light shelves, a concept which was validated by evaluating the performance related to saving building energy and improving indoor light uniformity through a full-scale testbed. This study used an external light shelf with no prism sheet, a window with a prism sheet applied, and a window with both an external light shelf and prism sheet applied as Case 1, Case 2, and Case 3, respectively, and analyzed the illuminance distribution and lighting energy consumption required to maintain the optimal indoor illumination for each case. This study also derived the optimal specifications for each case to save building energy and considered the flow of natural light to analyze the performance evaluation results. The main findings are as follows: (1) the optimal specifications to improve daylighting performance were derived for Case 1, requiring the application of operating techniques; (2) Case 2 was not suitable for saving energy and improving light uniformity when compared to Case 1; and (3) Case 3 was effective in saving building energy. In Case 3, even when the light shelf was fixed at 20° without moving, it saved building energy and improved light uniformity compared to Case 1. However, the prism sheet in Case 3 should be detached during winter to maximize building energy savings.

Classroom Lighting Energy-Saving Control System Based on Machine Vision Technology

2018 ◽  
pp. 143-149 ◽  
Author(s):  
Ruijie CHENG
Keyword(s):  
Control System ◽  
Machine Vision ◽  
Energy Saving ◽  
Back Propagation ◽  
Back Propagation Neural Network ◽  
Lighting Control ◽  
Lighting Energy ◽  
Neural Network Algorithm ◽  
Energy Saving Control ◽  
Model Algorithm

In order to further improve the energy efficiency of classroom lighting, a classroom lighting energy saving control system based on machine vision technology is proposed. Firstly, according to the characteristics of machine vision design technology, a quantum image storage model algorithm is proposed, and the Back Propagation neural network algorithm is used to analyze the technology, and a multi­feedback model for energy­saving control of classroom lighting is constructed. Finally, the algorithm and lighting model are simulated. The test results show that the design of this paper can achieve the optimization of the classroom lighting control system, different number of signals can comprehensively control the light and dark degree of the classroom lights, reduce the waste of resources of classroom lighting, and achieve the purpose of energy saving and emission reduction. Technology is worth further popularizing in practice.

About Measures of the State Support for Technical Equipment of Agricultural Producers

2020 ◽  
pp. 20-27
Author(s):  
A.Ya. Kibirov ◽  
Keyword(s):  
Statistical Analysis ◽  
Energy Saving ◽  
High Performance ◽  
The State ◽  
Agricultural Products ◽  
Technical Equipment ◽  
Agricultural Machinery ◽  
State Support ◽  
Agricultural Producers ◽  
Technical Base

The article uses methods of statistical analysis, deduction and analogy to consider programs at the Federal, regional and economic levels, which provide for measures aimed at improving the technical equipment of agricultural producers. Particular attention is paid to the acquisition of energy-saving, high-performance agricultural machinery and equipment used in the production and processing of agricultural products. An assessment of the effectiveness of state support for updating the material and technical base of agriculture is given. Based on the results of the study, conclusions and recommendations were formulated.

Energy savings potential of new aeration system: Full scale trials

2012 ◽  
Vol 7 (4) ◽  
Author(s):  
A. Lazić ◽  
V. Larsson ◽  
Å. Nordenborg
Keyword(s):  
Control System ◽  
Energy Consumption ◽  
Total Energy ◽  
Energy Savings ◽  
Treatment Plant ◽  
Full Scale ◽  
Total Energy Consumption ◽  
Aeration System ◽  
Fine Bubble ◽  
Aeration Control

The objective of this work is to decrease energy consumption of the aeration system at a mid-size conventional wastewater treatment plant in the south of Sweden where aeration consumes 44% of the total energy consumption of the plant. By designing an energy optimised aeration system (with aeration grids, blowers, controlling valves) and then operating it with a new aeration control system (dissolved oxygen cascade control and most open valve logic) one can save energy. The concept has been tested in full scale by comparing two treatment lines: a reference line (consisting of old fine bubble tube diffusers, old lobe blowers, simple DO control) with a test line (consisting of new Sanitaire Silver Series Low Pressure fine bubble diffusers, a new screw blower and the Flygt aeration control system). Energy savings with the new aeration system measured as Aeration Efficiency was 65%. Furthermore, 13% of the total energy consumption of the whole plant, or 21 000 €/year, could be saved when the tested line was operated with the new aeration system.

ENERGY SAVING COMPLEX OF MODULAR TIPE FOR SPACECRAFT POWER SUPPLICTS FULL-SCALE ELECTRICAL TESTS

2020 ◽  
Author(s):  
E.A. Mizrakh ◽  
◽  
D.K. Lobanov ◽  
D.N. Poymanov ◽  
S.B. Tkachev ◽  
...  
Keyword(s):  
Energy Saving ◽  
Full Scale

Application of High Performance Electro-Hydraulic Synchronous Servo System on NC Broaching Machine

2013 ◽  
Vol 721 ◽  
pp. 497-500
Author(s):  
Guo Jin Chen ◽  
Jing Ni ◽  
Ting Ting Liu ◽  
Ming Xu
Keyword(s):  
High Performance ◽  
Control Process ◽  
Servo System ◽  
Numerical Control ◽  
Servo Drive ◽  
Loop Control ◽  
Performance Accuracy ◽  
Drive Control ◽  
Hydraulic Servo ◽  
Output Quantity

Aiming at the lower performance, accuracy and efficiency of the existing motion control process for the traditional broaching machine, the paper studies the high-performance dual-hydraulic synchronous servo drive control technology. The synchronous electro-hydraulic servo system forms the closed loop control by the detection and feedback of the output quantity. It eliminates and restrains largely the influence of the adverse factors to obtain the high-precision synchronous driving performance. The numerical control system based on the real-time error compensation and the intelligent control to the auxiliary machinery is developed. It is used for the CNC broaching machine to make the steady-state synchronous displacement error of the double cylinders be ≤ 0.5mm.

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